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CVE-2026-100665

Netty 4.2.11 through 4.2.17 QUIC Hostname Verification Bypass

8.7 High

Netty versions from 4.2.11.Final before 4.2.18.Final contain an incomplete hostname verification fix in the QUIC certificate verification path when using a plain X509TrustManager. The BoringSSLCertificateVerifyCallback discards the SSLEngine for plain trust managers, preventing endpoint identification from running even when HTTPS verification is configured. Attackers on the network path can present a certificate chain for the wrong hostname that the plain trust manager accepts, bypassing hostname authentication for QUIC clients.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
High
Integrity
None
Availability
None

Exploit likelihood

0.37%Up 0.1 points since Sep 27, 2026
90%50%10%1%

What each source reports

CVE List Score used 8.7

Netty 4.2.11 through 4.2.17 QUIC Hostname Verification Bypass

Netty versions from 4.2.11.Final before 4.2.18.Final contain an incomplete hostname verification fix in the QUIC certificate verification path when using a plain X509TrustManager. The BoringSSLCertificateVerifyCallback discards the SSLEngine for plain trust managers, preventing endpoint identification from running even when HTTPS verification is configured. Attackers on the network path can present a certificate chain for the wrong hostname that the plain trust manager accepts, bypassing hostname authentication for QUIC clients.

Record
CVE-2026-100665
CVSS 4.0
8.7 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Weakness
CWE-295
Updated
2026-11-02
EUVDEUVD-2026-87759 8.7

Netty versions from 4.2.11.Final before 4.2.18.Final contain an incomplete hostname verification fix in the QUIC certificate verification path when using a plain X509TrustManager. The BoringSSLCertificateVerifyCallback discards the SSLEngine for plain trust managers, preventing endpoint identification from running even when HTTPS verification is configured. Attackers on the network path can present a certificate chain for the wrong hostname that the plain trust manager accepts, bypassing hostname authentication for QUIC clients.

Record
EUVD-2026-87759
CVSS 4.0
8.7 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
Updated
2026-11-02
GitHub AdvisoriesGHSA-4qw4-fmqv-qhv8 8.7

Netty versions from 4.2.11.Final before 4.2.18.Final contain an incomplete hostname verification...

Netty versions from 4.2.11.Final before 4.2.18.Final contain an incomplete hostname verification fix in the QUIC certificate verification path when using a plain X509TrustManager. The BoringSSLCertificateVerifyCallback discards the SSLEngine for plain trust managers, preventing endpoint identification from running even when HTTPS verification is configured. Attackers on the network path can present a certificate chain for the wrong hostname that the plain trust manager accepts, bypassing hostname authentication for QUIC clients.

Record
GHSA-4qw4-fmqv-qhv8
CVSS 4.0
8.7 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Weakness
CWE-295
Updated
2026-11-02
NVD 8.7

Netty versions from 4.2.11.Final before 4.2.18.Final contain an incomplete hostname verification fix in the QUIC certificate verification path when using a plain X509TrustManager. The BoringSSLCertificateVerifyCallback discards the SSLEngine for plain trust managers, preventing endpoint identification from running even when HTTPS verification is configured. Attackers on the network path can present a certificate chain for the wrong hostname that the plain trust manager accepts, bypassing hostname authentication for QUIC clients.

Record
CVE-2026-100665
CVSS 4.0
8.7 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Weakness
CWE-295
Updated
2026-11-02
OSV 8.7

Netty 4.2.11 through 4.2.17 QUIC Hostname Verification Bypass

Netty versions from 4.2.11.Final before 4.2.18.Final contain an incomplete hostname verification fix in the QUIC certificate verification path when using a plain X509TrustManager. The BoringSSLCertificateVerifyCallback discards the SSLEngine for plain trust managers, preventing endpoint identification from running even when HTTPS verification is configured. Attackers on the network path can present a certificate chain for the wrong hostname that the plain trust manager accepts, bypassing hostname authentication for QUIC clients.

Record
CVE-2026-100665
CVSS 4.0
8.7 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
Weakness
CWE-295
Updated
2026-11-02
OSVUBUNTU-CVE-2026-100665 8.7

Netty versions from 4.2.11.Final before 4.2.18.Final contain an incomplete hostname verification fix in the QUIC certificate verification path when using a plain X509TrustManager. The BoringSSLCertificateVerifyCallback discards the SSLEngine for plain trust managers, preventing endpoint identification from running even when HTTPS verification is configured. Attackers on the network path can present a certificate chain for the wrong hostname that the plain trust manager accepts, bypassing hostname authentication for QUIC clients.

Record
UBUNTU-CVE-2026-100665
CVSS 4.0
8.7 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
netty
Ubuntu:Pro:14.04:LTS
 All versions, plus listed versions
1:3.2.6.Final-21:3.2.6.Final-2+deb8u2build0.14.04.1~esm11:3.2.6.Final-2+deb8u2ubuntu0.1~esm1
 None known
netty
Ubuntu:Pro:16.04:LTS
 All versions, plus listed versions
1:3.2.6.Final-21:4.0.32-11:4.0.33-11:4.0.34-11:4.0.34-1ubuntu0.1~esm1
Show 4 moreShow less
1:4.0.34-1ubuntu0.1~esm21:4.0.34-1ubuntu0.1~esm31:4.0.34-1ubuntu0.1~esm41:4.0.34-1ubuntu0.1~esm5
 None known
netty
Ubuntu:Pro:18.04:LTS
 All versions, plus listed versions
1:4.1.7-41:4.1.7-4ubuntu0.1~esm11:4.1.7-4ubuntu0.11:4.1.7-4ubuntu0.1+esm11:4.1.7-4ubuntu0.1+esm2
Show 5 moreShow less
1:4.1.7-4ubuntu0.1+esm31:4.1.7-4ubuntu0.1+esm41:4.1.7-4ubuntu0.1+esm51:4.1.7-4ubuntu0.1+esm61:4.1.7-4ubuntu0.1+esm7
 None known
netty
Ubuntu:Pro:20.04:LTS
 All versions, plus listed versions
1:4.1.33-11:4.1.33-21:4.1.33-31:4.1.45-11:4.1.45-1ubuntu0.1~esm1
Show 5 moreShow less
1:4.1.45-1ubuntu0.1~esm21:4.1.45-1ubuntu0.1~esm31:4.1.45-1ubuntu0.1~esm41:4.1.45-1ubuntu0.1~esm61:4.1.45-1ubuntu0.1~esm7
 None known
netty
Ubuntu:Pro:22.04:LTS
 All versions, plus listed versions
1:4.1.48-41:4.1.48-4+deb11u1build0.22.04.11:4.1.48-4+deb11u2build0.22.04.11:4.1.48-4+deb11u2ubuntu0.1~esm11:4.1.48-4+deb11u2ubuntu0.1~esm2
Show 5 moreShow less
1:4.1.48-4+deb11u2ubuntu0.11:4.1.48-4+deb11u2ubuntu0.1+esm11:4.1.48-4+deb11u2ubuntu0.1+esm31:4.1.48-4+deb11u2ubuntu0.21:4.1.48-4+deb11u2ubuntu0.2+esm1
 None known
netty
Ubuntu:Pro:24.04:LTS
 All versions, plus listed versions
1:4.1.48-71:4.1.48-81:4.1.48-91:4.1.48-9ubuntu0.1~esm11:4.1.48-9ubuntu0.1~esm2
Show 6 moreShow less
1:4.1.48-9ubuntu0.11:4.1.48-9ubuntu0.1+esm11:4.1.48-9ubuntu0.1+esm31:4.1.48-9ubuntu0.21:4.1.48-9ubuntu0.2+esm11:4.1.48-9ubuntu0.2+esm2
 None known
netty
Ubuntu:26.10
 All versions, plus listed versions
1:4.1.48-161:4.1.48-16ubuntu1
 None known
netty
Ubuntu:Pro:26.04:LTS
 All versions, plus listed versions
1:4.1.48-101:4.1.48-111:4.1.48-121:4.1.48-131:4.1.48-141:4.1.48-161:4.1.48-16ubuntu0.1~esm2
 None known

History

History
RecordedChangedSources
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-100665 is a high vulnerability (CVSS 8.7) in Netty, published September 26, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.37%, the 30th percentile. No source names a fixed version.

References

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